Various cleanups: bail if make_frags true and fragment files given. bail if NMR_in file specified but cannot be found.
Various cleanups:
bail if make_frags true and fragment files given.
bail if NMR_in file specified but cannot be found.

Use logger for NMR print statments.

Bail if name not given or is not 4 chars - not sure if that sensible yet...

linucks/ample,rigdenlab/ample,linucks/ample,rigdenlab/ample